What’s Vulnerable › Vulnerabilities

CVE-2020-36049

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-08 · updated 2026-06-17
• Weakness: CWE-770

Description

socket.io-parser before 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach is used.

Affected products

• Socket.io-Parser: before 3.4.1 — fixed in 3.4.1

How to fix

Upgrade to a fixed version: Socket.io-Parser 3.4.1. Check the vendor advisory for mitigations.

References

• https://blog.caller.xyz/socketio-engineio-dos/
• https://github.com/bcaller/kill-engine-io
• https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55
• https://blog.caller.xyz/socketio-engineio-dos/
• https://github.com/bcaller/kill-engine-io
• https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55

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